"Silly Sarah" page 55 (Patreon)

Now the campers look past Sarah's soaking wet lower body to see and study the wet spot and puddle of pee on her bed sheets. They can all tell that she held as much as she could before nature took over, as she cutely puts it. Nonetheless they still tease her for easily being able to avoid wetting the bed if she had just peed before going to sleep.